280291 has 8 divisors (see below), whose sum is σ = 310464. Its totient is φ = 250920.

The previous prime is 280277. The next prime is 280297. The reversal of 280291 is 192082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280291 - 2⁹ = 279779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760 + ... + 1066.

It is an arithmetic number, because the mean of its divisors is an integer number (38808).

2²⁸⁰²⁹¹ is an apocalyptic number.

280291 is a deficient number, since it is larger than the sum of its proper divisors (30173).

280291 is a wasteful number, since it uses less digits than its factorization.

280291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 280291 is about 529.4251599613. The cubic root of 280291 is about 65.4439821735.

Subtracting from 280291 its reverse (192082), we obtain a square (88209 = 297²).

The spelling of 280291 in words is "two hundred eighty thousand, two hundred ninety-one".